Patent GB-1362661-A (GB)
Title: Electric batteries formed of stacked lamina-type cells
IPC: H01M6/48
Filed: 1971-11-23
Abstract: 1362661 Batteries comprising lamina-type cells ESB Inc 23 Nov 1971 [21 Dec 1970 (5)] 54427/71 Heading H1B A method of making a series of bipolar electrodes comprises depositing positive electrode material at intervals along one side of a continuous carrier strip and forming the negative electrodes either by depositing negative electrode material at corresponding intervals along the other side of the strip or by using the other side of the strip itself as the negative electrode material. The bipolar electrodes may be separated from one another by cutting the strip either before or after assembly of the electrodes into a stack to form a battery. In one method of assembly a plurality of batteries are simultaneously assembled side-by-side by stacking a plurality of of carrier strips each having a series of bipolar electrodes thereon and then cutting the strips between the electrodes. Five different forms which the carrier strip may take, designated A, B, C, D, E, are described with reference to drawings, these forms being A, electrically .conductive plastics; B, electrically non-conductive plastics having conductive means extending through holes therein; C, metal coated on both sides with an electrochemically non-reactive electrically conductive adhesive; D, metal having one surface which is electrochemically reactive and one surface which is coated with an electrochemically non-reactive electrically conductive adhesive; E, metal having at least one surface which is electrochemically non-reactive. In modifications of form E the metal strip is a bimetal or trimetal (Figs. E5, E6, not shown). In the embodiment of form A, Figs. A1, A2, A3, an electrically conductive plastics carrier strip A50 from a roll A250 is passed between positive and negative electrode applicators 220, 230, respectively, to form positive electrodes 20 and negative electrodes 30. Fig. A2 shows a complete battery made by stacking three bipolar electrodes shown in magnified cross-section in Fig. A3. The stack additionally includes electrolyte impregnated separators 40, a positive end electrode 20A, negative end electrode 30A, liquid impervious electrically-conducting layers 80, 90 of plastics material, metal current collectors 60, 70 and electrically-insulating sealing layers 100. The battery may use various combinations of positive and negative electrode materials and electrolytes. The positive electrode materials mentioned are : manganese dioxide, lead dioxide, nickel oxyhydroxide, mercuric oxide, silver oxide, silver chloride, lead chloride and the organic materials dinitrobenzene and azodicarbonamide compounds. The negative electrode materials may be zinc, aluminium, magnesium, lead, cadmium and iron. The electrolytes may be ammonium chloride and/or zinc chloride, the hydroxides of potassium, sodium and/or lithium, sulphuric or phosphoric acid. Fig. B2 shows a form B bipolar electrode having electrically conducting adhesive B53 penetrating holes in the non-conductive plastics strip B51, the adhesive supporting the electrodes 20, 30. In a modified form B, Fig. B6, the strip has a conductive plastics core B58 covered with non- conductive layers B51a, B51b and also includes conductive metal strips B59, B54 and conductive adhesive B53. In the form C, Fig. C4, conductive adhesive layers C54, C56 are applied to the sides of metal carrier strip C52. In the form D, Fig. D4, a zinc carrier strip D52 serving as the negative electrode material is coated on one side with conductive adhesive D56. In the form E, Fig. E4, the metal carrier strip E50 may be of titanium, tantalum or gold.